I just bought one of these beasts. I can't thank you enough for posting this.
@nathanielweise9932
3 жыл бұрын
I'm in the same boat this was a life saver
@soulslip
7 ай бұрын
Thanks for this video! I have a Tascam 48 OB and channels 3 and 5 went out randomly and am pretty sure it is due to having to move or “scoot” the unit over while recording one day. Luckily i also have a parts unit that I can swap a card or two out with... thanks again, it was helpful. Cheers from USA!
@pcallas66
3 жыл бұрын
On my rubber tire for my MSR-16 I had a spray can of rubber cement, sprayed the hub and gently hit the inside of the tire. It was very neat and is holding up extremely well after three years.
@mimiraver2127
5 жыл бұрын
I really love this series you did and appreciate how clear you made everything. One comment though about the pinch roller rubber replacement. When you dissolve the rubber in an acetone bath you are also removing any grease from the bearing inside which may cause problems/noise in the future. I believe you can still get this part new and may be a better option.
@DaveElectronics
5 жыл бұрын
Hi, thanks for the comment! Yes, i dissolved the grease from the bearing, but unfortunately was the only option for me. A new part is a better option, but it is not cheap (approx. 80-90€ here, which is almost half the price i spent for the entire recorder plus the NR units...) The ball bearing is sealed, so you can’t really re-grease it, although you could take the bottom sealing off and do it, I decided to just keep it as it was.
@brianksiazek4666
5 жыл бұрын
You might want to clean all of the calibration controls. Can't wait to see Part 3!!
@DaveElectronics
5 жыл бұрын
Hi, i sprayed some contact cleaner before the calibration process.. unfortunately the contacts on the main board (that connects all the amplifier boards) were corroded after almost 30 years of neglect... recently i had to disassemble it again and clean the board in a isopropanol bath that fixed most of the contact problems. Part 3 is the “recording with tape” part, where i record a little song with the machine (i also made a little music video about it).
@steelcantuna
4 жыл бұрын
I'm just an poor old country boy from the hill country of Texas. I show do wish ya'll would/could take time out to make a detailed video about calibrating a your Teac. Especially your A-3440 or your Tascam 38. I'm talking about VERY detailed as if you were talking to a class room full of 6th graders. I just want to record some songs I made up onto these old machines. But, my old Teac's need some TLC, as do we all.
@ladronsiman1471
6 ай бұрын
My idea is to get one of these and change the plastic face to an aluminum plate
@davidgadd57
10 күн бұрын
I have the exact same machine and the same problem with 6 of the meters not deflecting. Checked all the meters and they're all good. The signal is getting thru on all channels. Would you suspect the same problem you had? Should I start by thoroughly cleaning the boards and connections to start? This problem arose all at once.
@mateoflores821
4 жыл бұрын
Hello, thank you very much for these videos, they have been of great help in the restoration and tuning of my Tascam 38, I wanted to know a little more about the baking of the tapes, together with the recorder I got several tapes that have been without for many years. used and I wanted to know if with baking I can use them again, thank you very much in advance!
@bobsbits5357
2 жыл бұрын
HI out there in the audio game us tascam fans need the tec info on mk 2 audio cards not the mk1 ones i have a mix of models of tasxam 38 the mum audio pcb is not to same i can get them to play back only i had to take of the pcb socket and put new one on where they and needed for play back as i have alot of bad cards that rill need work on the record side the 149 khz is playing up in and out of the 2 amps i was told by a tec you got to have the right cards in the right model
@kuppaswamyswamy8232
3 жыл бұрын
Everything working but pinch roller dc motor is not running... what's the fault??
@bobjerome5390
4 жыл бұрын
hi the missing parts are for the tascam 34B 34 deck if you need a 34 card just fill in the missing parts i had to do this once
@bobjerome5390
3 жыл бұрын
hi this is funny before you do any audio line up CHECK THAT THE VU POT IS IN THE RIGHT PLACE i send a test sig in to the meter amp as i have seen alot played around with R141 pot and in all the decks i work on it not in the right place this has to be CHECKED FIRST R141
@explodingPSYCH
2 жыл бұрын
I'm doing the input calibration but I don't have a meter with a decibel setting. I used a DMM to measure my test tone (DA converters) to 0.3v as per manual. I then attached an oscilloscope to the output and set the input trim until the oscope matched the 0.3v. However, at this input setting, I cannot adjust the meters to read zero (they only get to about -3db at max). Could I be doing this wrong? Currently 0.3v in and out reads at -10 on the meter.
@DaveElectronics
2 жыл бұрын
Hi, your procedure seems to be correct.. from what I understand, the input/output calibration is ok, but the vu meter is out of tolerance by too much to compensate. One question: is your dmm a true rms meter? I would read the 0.3v directly from the oscilloscope and adjust the output accordingly. The peak value should be a little higher, so that would explain the vu meter out of range.
@explodingPSYCH
2 жыл бұрын
@@DaveElectronics thanks for the response. I think my issue may be due to the impedance of the oscope. When I attach the signal to my 10k impedance mixer and split it to the oscope it gets closer. I think the 50k load is needed, so I'll try to recreate that with a resistor between the output and the oscope.
@benwilliams9075
2 жыл бұрын
What is the name of the adapter you used to go from the RCA outs of the tape machine to the multimeter?
@DaveElectronics
2 жыл бұрын
Hi, from what I remember it was an rca to bnc cable and bnc to banana connector to the multimeter
@bobjerome5390
3 жыл бұрын
hi you see i have a test card i put in the ports i do a test the audio track with it if the there dry solder the es card will tell me some times i have to pull the cage and mum card out top tip put the tascam on t side take the panel of where your hands are alot easyer to see where to line up he audio card and molex plugs i have work on 20 plus beware the heat can over heat the card jumper pins they will drop out only if not the right way round bob's bit's
@airforcetone
Жыл бұрын
dude where are you based i would literally pay you set mine up...
@VintageElectronicsGeek
5 жыл бұрын
You do great work! Will there be a part 3? This one kinda just seemed to end suddenly...left you wanting more! :) ~Jack, VEG
@DaveElectronics
5 жыл бұрын
Thanks Jack! There will be a part 3 for sure! :) Ps. I’m looking forward to your video about the Sony R2R! Dave
@VintageElectronicsGeek
5 жыл бұрын
Very cool Dave, I am looking forward to it! I'm getting ready to have eye surgery real soon, so it may not happen for a short spell, but it will happen, I've never worked on one before, so I hope I am as successful as you are. Best Regards. ~Jack, VEG
@mr.howard1
3 жыл бұрын
Is there any need to change all those electrolytic capacitors?
@kuppaswamyswamy8232
3 жыл бұрын
What's the motor name?
@AlpsMediaLLC
4 жыл бұрын
Hello I have a Tascam 38 that I've replaced the belt and a pinch roller on but then noticed channel 6 and had eight problems. I replaced both cards and the problem remains. One of them would not record and the other would not play back. I was wondering if you knew of someone that might have an idea where the problem lies since I do know now it's not the record play app assembly. The machine was very clean inside and of course the belt was destroyed but it wasn't stuck all over so it cleaned up quite quickly and I replaced it. Purchased a new pitch roller tire and made that repair as well. Again if you know of anyone that might be able to issue and repair it for me I'd appreciate it. Thank you!!!
@DaveElectronics
4 жыл бұрын
Hi, Well, on mine I had a similar problem on channel 7, it would not record, but it played back just fine. I knew that it was not a problem in the record head, because it played back fine with sync enabled (that uses the record head to both record and play back). I managed to trace down the problem to a faulty connection between the main connector board and the card of the 7th channel. As far as I know it's a common problem in those machines.. after all those years, the connectors tend to not make good contact anymore. I tried reseating the card, replacing it with another (good) channel card, spraying some contact cleaner, etc.. It came good for a while, but the problem eventually came back. What i did to fix it definetly was completely removing the main connector board, clean it with isopropanol (if yours is already clean, you can skip this step) and resoldering all the connectors. it's a long and tedious work to do (you have to pretty much dissassemble completely the back of the machine) but it was worth it. Now everything works as it should. Hope it helps! :)
@exousia157
2 жыл бұрын
Where can I get the replacement parts for Teac Reel to Reel tape decks?
@DaveElectronics
2 жыл бұрын
Hi, i usually get parts from ebay
@dylang-s3821
3 жыл бұрын
Hi there, what glue did you use for the pinch wheel tyre? have the same problem
@DaveElectronics
3 жыл бұрын
Hi, i can’t really remember the exact brand, but it was a cyanoacrylate based adhesive. I think even epoxy would do the job just fine.
@brianksiazek4666
5 жыл бұрын
I just got my new pinch roller, and was wondering what kind of glue you used to glue it to the bearing? Thanks.
@DaveElectronics
5 жыл бұрын
Hi, i used a bicomponent glue for the pinch roller. You can actually use almost any glue made for rubber parts or plastic, as long as it does not have strong solvents (like acetone) that can melt your new pinch roller..
@nicholashurdman8210
5 жыл бұрын
Hi, great vid, thanks for posting! I have the same problem that you had where the VU meters are unresponsive but the input and output are both working fine, it is just on channel 1. I tried opening the machine up and spraying with contact cleaner and reseating everything I could on the mother board but it still is unresponsive. Is there something else that might be causing it? Do I need to take the whole board out and get it in the bath!!! would like to avoid that if possible! Thanks again, Nick
@DaveElectronics
5 жыл бұрын
Hi, thanks for your comment! Well, in my case, i knew that was not an electrical problem (the driver circuit for the vu was fine) because they did work sometimes, so I figured out that it must have been a contact problem. If in your case the VU are completely unresponsive (eg. no matter what you do to the contacts, the VUs don't move), it might be the actual driver circuit, which is separated from the amplifier circuit for the channel (although it's on the same board), so that could explain why you have a working amplifier but no VU movement. It could also be the actual VU itself.. try measure the resistance of the VU meter's coil and start by there. Hope it helps! Let me know Dave
@mikeygee5641
4 жыл бұрын
Hey great video man! Do you mind if I ask what brand of scale you were using there to test the brake torque??
@DaveElectronics
4 жыл бұрын
Hi, The procedure of adjusting the brake torque in the service manual only requires a caliper. The caliper I was using is no-branded (from china?) unfortunately..
@rudycarroll8107
4 жыл бұрын
Thanks so much for these great videos. I'm fixing a Tascam 38 at the moment and have a very specific problem. It records fine but won't erase! I wonder if you have any idea what the solution might be?
@DaveElectronics
4 жыл бұрын
Thanks for the comment! Well, i depends.. it could be a faulty erase head, a bad contact (easy fix), or even a bad erase head driver circuit. If you have some basic experience in electronics, with a basic multimeter (or even better, an oscilloscope) you can check first if the erase head receives the signal. If it doesn’t, check the connections and cables and then check the board. Hope it helps :)
@rudycarroll8107
4 жыл бұрын
Dv555 yup I figured it out. The erase head connector had come loose! Easy fix. Thanks!
@brianksiazek4666
5 жыл бұрын
Is 0.3 V signal RMS or Peak to Peak? Great video by the way!
@DaveElectronics
5 жыл бұрын
Hi, I can’t remember exactly, but i think it was RMS (the multimeter in the video can only read RMS values so I think that’s correct)
@1234saul
3 жыл бұрын
How do you take off the pinch roller?
@DaveElectronics
3 жыл бұрын
You just have to unscrew the top aluminium cap.
@bobjerome5390
3 жыл бұрын
hi to all there no need to change them caps in this deck ever i have alot of 38 deck never ever put new cap on any of them ever to many love to pimp them power unit cap's yes audio power rails 470uf the 4 of them they do go and the 5v reg to the tranport logic this would need to be up dated i had them drop out before there's alot of tec;s making money out of people out there
@ybblue2732
4 жыл бұрын
My Tascam 38’s electric counter burned out, and I replaced it with a new one, but it still does not work. What could be causing it to not work? The zero return does not work either. Would love your opinion on this!
@DaveElectronics
4 жыл бұрын
Hi! Well if you have already replaced the vfd, and still it does not work (not even lights up?) it could be a power supply issue or even a bad contact problem.. from what i recall the driver chip for the vfd is located on the actual display board, so presumably if you’ve replaced the entire thing, the chip is working too. I suggest you to check the voltage rails on the power supply board and start by there.. if I remember correctly all test points locations are illustrated in the manual.
@ybblue2732
4 жыл бұрын
Dv555 will do! At the worst case scenario, will I have to replace that entire unit that supports the counter?
@DaveElectronics
4 жыл бұрын
The worst case is a dead display driver chip, so yeah, you’ll have to replace the chip itself or the board..
@ybblue2732
2 жыл бұрын
@@DaveElectronics hey, coming back to this a year later and still no resolution. How should I be checking the voltage from the board to the vfd? Follow the harness from the connection down to the board responsible and then what points do I measure? Also, what chips could be the culprit in this situation?
@DaveElectronics
2 жыл бұрын
Hi! So does the vfd even light up?
@artlifestudiocologne7070
3 жыл бұрын
Greetings and thank you very much for your video! Im searching for a solution of my problem which is similar to one of yours.. Your channel 5 , is my channel 6. @;-) When I startet a regular check of this mashine I noticed that the VU is not working on that channel. I was in a downmix for a client so I started to change channels instead. But I didn’t try if it plays back on the channel. I will check that with an old recording! If so, you say, it could be the driver of the VU? How can I fix that? Do you have a prt 3 where you find the problem and solved it for your channels why the mashine didn’t pick up signal? I never opened it up, so I start from 0. It was serviced 2012 the last time .. Cheers and much thanks in Advance! Best wishes and healthiness outa Germany 🇩🇪 ---- Steve
@DaveElectronics
3 жыл бұрын
Hi! Thanks for the comment :) In my particular case it was a contact problem. The main interconnect board (on which are connected all the channel boards) was covered with a thin layer of coating. Over all those years (the machine is from the '80s), dust created a layer on top and it eventually became conductive, creating all sort of problems: from what I recall channel 4, 5 and 7 had problems. One channel would record and playback just fine, but no VU meter movement; another channel's VU meter was ok, but no playback; ecc.. Eventually, after turning the machine on and off a couple of times, for example the channel without the VU meter came back to life (and the next day it did not work again...). Contact problems. What I did to resurrect the machine was quite a drastic solution (and a huge pain to do): I completely disassembled the machine, removing all the channel boards and the main interconnect board. I washed the main interconnect board with isopropanol and cleaned all the residues of the conductive coating and dust layer. I resoldered ALL the connectors (on the main board) and reassebled everything back together. After that it worked fine. Unfortunately i did not film the process, but perhaps in the future i plan to do a video about contact problems in this machine, it seems to be quite common. With that being said, in your case it might be just bad contacts. What I suggest you to do first is to try the faulty channel by recording and playing back a tone and see if the recorder works. Reseat the faulty channel board and reseat also the (wire) connectors on the main board. If it's only the VU meter (so the machine records and plays back the tone just fine), it could still be bad contacts or a faulty driver. I would check with a multimeter if the VU meter's coil is fine. Hope it helps! :) P.S. You have a really great studio! I hope you can use your Tascam 38 again!
@artlifestudiocologne7070
3 жыл бұрын
@@DaveElectronics thank you very much that helps a lot! I have now two days of recording sessions and I will start checking your points out on Monday step by step. Are you on Facebook? Maybe it’s a better connection to write for this problem. And thanks for your words! That’s very kind. Where did you see it? On the promo-video? You can reach me and my studio here m.facebook.com/artandlifestudiocologne/?ref=bookmarks facebook.com/steve.kuster Cheers 🍻
@DaveElectronics
3 жыл бұрын
Unfortunately I don’t have Facebook, but keep me updated if you find the problem :) I really hope you can fix it, it’s a very nice machine. And yes, I watched the promo video on your channel ;) Cheers! 🍻 Dave
@artlifestudiocologne7070
3 жыл бұрын
@@DaveElectronics greetings Dave! Hope all is well.. As I said, I checked my old lady and I figured out, that the income signal doesn’t affect channel 6, but with recorded source, it plays back on channel 6. so I guess I need to check the connections beginning downward from the input RCAs. Of what would you say? I did some pictures but can’t attach them here.. Regards!!!
@DaveElectronics
3 жыл бұрын
Hi! So from what I understand, channel 6 plays back but it does not record. Have you tried reseating the channel 6 board? It could be just some bad contacts.. if it still doesn’t work you can feed a signal through the input rca and track it down the line. If you have an oscilloscope is much easier, but it can be done with a multimeter (having on hand the schematic diagrams). Hope it helps! :)
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